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A038174
as a simple table
n
a(n)
1
1
2
1
3
4
4
25
5
210
6
2209
7
24651
8
284768
9
3360995
10
40328652
11
490455189
[1,1,4,25,210,2209,24651,284768,3360995,40328652, 490455189]